It’s no secret that tech leasing is driving San Francisco’s office market, but exactly how much?

At the end of last year, San Francisco was home to more than 53,000 tech jobs— a number that has grown significantly in recent years and is expected to keep growing.

What that means for real estate is that of the close to 3 million square feet of office space under construction,100 percent of the tenants pre-leasing space in forthcoming buildings are tech companies according to data crunched by Cushman & Wakefield.

So far, those firms snatched up 70.1 percent or about 2.2 million square feet of the space under construction.